Templet-filing jaws



T. T. JANIS.

TEMPLET FILING JAWS.

APPLICATION FILED MAR. 24, 1919.

Patentd May 9; 1922.

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THEODORE r. 'JANIs, or' orrrceeo, rumorsremnant-FILING.- JAWS.

To all'whom it may concern:

Be it known that I, THEODORE T. June, a citizen of the United States, residing at Chicago, county of Cook, State of Illinois, have invented a certain new and useful Improvement in Templet-Filing Jaws, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which'it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

In making small metal templets'the tool maker lays themout on blank-pieces and then files to the marks while holding the pieces in a vise. In filing, as a scratched line is approached, aburr is formed which obscures the line and makes it necessary that great care be taken in order to secure accuracy of work.

.The object of the present invention is to produce a simple, and novel device in which templet blanks may be -readily positioned and be firmly held in such a way that the workman need only file into a blank until the file touches a hardened limiting surface in the device, in order to be certain that exactly the right amount of material has been removed. v

A further object of the present invention is'to produce a device of the character just described which will serve also as'a base from which any desired angle may be conveniently and accurately measured so, that an edge of a templet may quickly be filed or groundso as to lieat any desired angle with respect to some other edge.

A further object of the presentinvention is to produce a simpleand novel templet holder which is adapted to be held in a vise or other supporting device or in a chuck,

mechanical or magnetic.

The various, features of novelty whereby ,my invention is characterized will hereintages, reference may be had to the following detailed descriptiontaken in connection with the accompanying drawing, wherein-z Figure 1 1s a side view .of a devlce arranged accordance with a preferred form of my invention;

Fig. 2 is a View of the op-po'site'side of the device fromtliat shown in Figgl and-showing an attachment which is omitted in Fig. 3 isatop' plan view; s I Fig. 4 is a section taken approximately on'line lrl of Fig. 3; g

' Fig. 5 is a section taken approximately'on I Fig. 7 isa sectiontaken approximately on line 7,7 of Fig. 3;

Specification'of Letters Patent. t t F 3 Application filed. March 24, new. Serial No. 284,551.

Fig. 8 is a section takenonjline 8-8 of Fig. 3, only one end ofthe devic'ebeing shown, and there being latemplet arranged in the device v Fig. 9 isa view similar'tojFig. 8 showing a different form'of templet from that illustrated in Fig. 8; and I a Fig. 10' is'a view similar to Figs. -8 and 9, showing a still different type of templet.

. Referring to the drawing, 1 and 2 represent two bars of extremely hard steel each ,of

which has at leasttwo contiguous faces made perfectly flat and arranged at right angles to each other. Preferably each-bar is made ac'curatelyrectangular in cross section as this greatly widens the field of use of'the device. 1 f

One of the rigidly connected therewith, while the other device has holes, 4:, accurately fitting the pins. The pins are arranged at right angles to the face fromf which they project and thereforewhen the bars are moved from and the bars from and toward each other and ex erting a force-which will'permit them to be clamped tightly upona piece of'work'; such H '85 bars has projecting 'from the side thereof apair of aligning pins 3," 3,

toward each other they always remain parmeans being preferably so designed as not to" obstruct the outer surfaces 0f the device -whenin use. In the arrangement shown, tliere'are three screws, 5, 6 and 7 extendingthrough one of the bars and into the other in parallelism with, the aligning pins. The heads of-the screws are preferably countersunk inone of the bars and the screws are A preferably made so short that when the bars "are clamped upon the thinnest'blank, in con- I nection with which it will be used in practice, the ends of the screws will not project beyond the outer side face of theother bar. The screws are conveniently placed along the longitudinal center of the bars. When the device is placed in a vise or other holder which is not adapted for precision work, there might be a tendency to tilt the bars relatively to each other and, in order to prevent this, I make use of set screws 8, Figs. 1 and 7 which are screw threaded through one of the bars and engage with the inner side face of the other bar; thus serving as abutments or stops which may be accurately adjusted after the work has been clamped in the device, thus guarding against any tilting of the bars if the device is subsequently placed in a holding support of some kind. In the arrangement shown, there are two of these set screws which may either be placed in the bar 1 as shown in Fig. 1 or in screw threaded openings, 9, in the bar 2 as shoWn in Fig. 2; the two sets of openings being diflerently located with respect to the length of the bars, so that the set screws may be placed where they will not interfere with the work being held at any given time.

After a templet blank has been properly laid out, it may be clamped in the device so as to bring the lines to which the blank is to be filed, one after another, exactly in the plane of the upper faces of the bars. The bars being made so hard that they will resist the action of a file, and the upper face and the inner side face of each bar meeting in a sharp corner forming the apex of an exact right angle, it will be" seen that after the blank has been placed in position, the workman needs only to file until the tool rests upon the hardened bars in order to finish an edge of the templet accurately to a line and accurately square with the side faces of the templet.

It may sometimes be desirable to be able to file on two edges of a blank arranged at right angles to each other or possibly at some other angle. In order to permit this to be done, an additional block, 10, may be provided; said block being detachable from the bars and being adapted to be adjusted along one or both of them. In the arrangement shown, each of the bars has in the upper edge a groove, 11, extending lengthwise thereof along the center. The block, 10, is made of the same thickness as each of the bars and is provided with a tongue, 12, as best seen in Fig. 8, adapted to enter either of the grooves. An elongated slot, countersunkat the top as indicated at 13, as best shown in Fig. 3, extends vertically through the block which is rigidly fastened in place by means of a screw, 14:, extending through the slot into one of the bars and having its head lying in the countersunk portion of the slot. Each of the bars is provided with a series of screw threaded holes, 15, in its upper edge; the screw 14 being adapted to be inserted in any one of these holes.

In the arrangement shown, one end of the block, as indicated at 16, is finished so that. it will be accurately at right angles to the top surface of the bars while the other end, as indicated at 17, is inclined at some suitable angle as, for example, forty five degrees.

For many purposes the block is not needed. However, when a templet such as shown, for example, at 18 in Fig. 8 is to be filed, the block may be placed in position on one of the bars and the templet blank be then clamped in place so that one edge of the arm 19 projects slightly above the upper surface of the bars while one edge of the arm 20 of the blank projects slightly beyond the square end of the block. The two edges may thus be filed without shifting the blank. This expedient not only saves time but it permits a perfectly sharp corner to be obtained between the horizontal and the vertical edges of the templet, without danger of marring either edge. Without the block, it

would be necessary first to file the edge on i the arm 19 and then the edge on the arm 20 with the arm 19 projecting upwardly and in danger of being marred by the file working on the arm 20.

In case the arm 20 lay at an angle of forty-five degrees to the arm 19, then the block could be reversed so as to permit the edge 17 to be used as the guiding edge dur-. ing the filing operation.

The block may also be made to serve simply as a measuring device for setting a projecting part at a right angle to the upper surface of the bars or at an angle corresponding to the inclination of the end 17.

Even though the block be not employed, the upper faces of the bars may be used as a base from which to measure any given angle. Thus, if the purpose is to make the two arms of the templet 18 lie at a given angle with respect to each other, a measuring instrument may be placed on top of the bars and the upwardly-projecting armof the work be adjusted thereby.

In Fig. 9 another use of the device is illustrated. The templet, 21, is intended to have a notch, 22, in one or both ends.- The end to be notched is first finished in the manner heretofore explained, and the templet is then raised a distance exactly equal to the depth of the notch to be formed; it being possible to make the measurement accurately from the upper surface of the bars. The workman need then only file into the projecting end of the templet until the tool touches the bars.

In Fig. 10 there is illustrated a templet, 24E, of such size that one of the clamping screws must be removed in order to make room for the work; the screw that is removed being the one in the center. It will be evident that where the work takes still other forms it might be necessary to remove some other clamping screw or shift the holding screws from one bar to the other,

Itwill be seen that my improved device provides means for conveniently holding work of various kinds which must be accurately finished by filing or grinding, per mitting the filing or grinding to be quickly done, and affording a variety of surfaces from which accurate measurements of distances and angles may bemade. It will also be seen that the device-can conveniently be held in a vise or chuck and,'by placing it against a fiat face plate, the work will be accurately held at right angles to the face laid against the plate,

and the device as a whole being arranged at plate. Another use to which the device can be put is'to clamp it to an angle plate while holding a piece of work; any one of three sides and, in some cases the fourth side from which the aligning pins project, being as occasion requires;

any desired angle to the edge of the angle plate.

While I have illustrated and described with particularity only a single preferred form of my invention, I do not desire to be limited to the exact structural details thus- 1 jaws.

having flat inner side faces parallel with each other, said screws passing through the bars and being of such length that the outer 'side faces of the bars are left unobstructed when a thin piece of work is gripped in the 2. A device of the character described,

.comprisingtwo bars of extremely hard steel accurately rectangular in cross section,

screws connecting the same together to form clamping jaws, and a block of extremely hard steel having a square end and adapted to rest upon one of said bars, and means for detachably and adjustablyv securing said block upon the latter bar.

3. A device of the character described comprising two bars of hard steel uniformly accurately rectangular in cross section throughout their lengths,

screws. connecting the same together to form'clamping jaws,

each bar having a groove extending longle tudinally through its upper face,a block of hard steel .having a square end, said block having on a side contiguous thereto a tongue adapted to fit into either of said grooves, and

either of said bars.

means for adjustably'securing said block'to v 4. A device of the character described comprising two bars of extremely hard.

steel accurately rectangular incross section throughout their lengths, and screws connecting the same together to form clamping bars, saidscrews passing. through the bars and being of such length that the outer faces of the bars are left unobstructed when a thin piece of work is gripped inthe jaws.

In testimony whereof, I sign this specification.

THEODORE T. JANIS. 

